Interaction Between Charge Characteristics and Cu2+ Adsorption-Desorption of Soils with Variable or Permanent Charge

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Interaction Between Charge Characteristics and Cu2+ Adsorption-Desorption of Soils with Variable or Permanent Charge

机译：电荷变化或永久电荷的土壤电荷特性与Cu2 +吸附-解吸之间的相互作用

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Charge characteristics and Cu2+ adsorption-desorption of soils with variable charge (latosol) and per-manent charge (brown soil) and the relationship between them were studied by means of back-titration andadsorption equilibrium respectively. The amount of variable negative charge was much less in variable-chargesoil than in permanent-charge soil and increased with the pH in the system, but the opposite trend occurredin the points of zero charge (PZCs). The amount of Cu2+ ions sorbed by permanent-charge soil was morethan that by variable-charge soil and increased with the increase of Cu2+ concentration within a certainrange in the equilibrium solution. The amount of Cu2+ ions desorbed with KCl from permanent-chargesoil was more than that from variable-charge soil, but the amount of Cu2+ ions desorbed with de-ionizedwater from permanent-charge soil was extremely low whereas there was still a certain amount of desorptionfrom variable-charge soil. The increase of PZC of soils with variable or permanent charge varied with theincrement of Cu2+ ions added. When the same amount of Cu2+ ions was added, the increments of PZC andvariable negative surface charge of permanent-charge soil were different from those of variable-charge soil.

机译：分别通过反滴定和吸附平衡研究了可变电荷（latosol）和永久电荷的土壤（棕壤）的电荷特性和Cu2 +的吸附-解吸关系。可变电荷土壤中的可变负电荷量要比永久电荷土壤少得多，并且随系统中pH值的增加而增加，但是在零电荷点（PZCs）上却出现了相反的趋势。在平衡溶液中一定范围内，永久电荷土壤吸附的Cu 2+离子的量大于可变电荷土壤吸附的Cu 2+离子的量。用KCl从永久电荷土壤中解吸的Cu2 +离子的量要多于从可变电荷土壤中解吸的Cu2 +离子的量，但是从永久电荷土壤中用去离子水解吸的Cu2 +离子的量极低，而从固定电荷土壤中解吸的仍有一定量可变电荷土壤。随电荷或永久电荷变化的土壤中PZC的增加随添加的Cu2 +离子的增加而变化。当添加相同量的Cu2 +离子时，永久电荷土壤的PZC增量和可变负表面电荷不同于可变电荷土壤。

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《土壤圈（英文版）》 |2002年第4期|321-328|共8页
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作者单位

Key Laboratory of Subtropical Soil Resources and Environment, Chinese Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070 China;

Key Laboratory of Subtropical Soil Resources and Environment, Chinese Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070 China;

Key Laboratory of Subtropical Soil Resources and Environment, Chinese Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070 China;

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 chi
中图分类土壤污染及其防治;
关键词
adsorption-desorption, Gu2+ ion, permanent-charge soil, variable-charge soil, variable negative surface charge;

机译：吸附-解吸;Gu2 +离子;恒电荷土壤;可变电荷土壤;可变负表面电荷;

Interaction Between Charge Characteristics and Cu2+ Adsorption-Desorption of Soils with Variable or Permanent Charge

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